Type someone's username in the box on the right, then fill out the form and copy the title of the page into the list below.
This is where the request form for the person or IP address you've requested is to be listed. And also remember to state a good reason, in the request body, for why the person is being blocked or banned. Because if you don't state a reason, the request will not be accepted and it will be deleted. It also might happen if a good reason isn't stated.